A wealthy Mexican Loyalist visits the Barkley's and brings with him a valuable necklace. A female anarchist then shows up at the ranch, plotting to bring the necklace back to Mexico to help fund the Revolution.
A played out mine that a Barkley mining partnership abandoned is now occupied by Chinese immigrants. The partnership needs to regain control of the old mine as a means to deliver air to an adjacent, ore rich mine.
A series of relatively petty thefts lead Nick to an embittered youth who he attempts to befriend. The stakes are raised when Nick finds himself held for ransom while tied up in a cave that is in danger of collapsing.